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Honors Biology Chapter 7Section 3 Cell Boundaries
surround all cells is a thin, flexible barrier that acts like the cell’s “gate keeper” made of lipid-bilayer provides protection & support
Fluid Mosaic Model phospholipids
resembles an ever-moving sea of fluid lipids that has large proteins bobbing along throughout the lipids
1. Phospholipids (~70% of membrane) 2. Cholesterol: changes fluidity of membrane 3. Glycolipids sugar molecule on lipid
Integral Proteins go all the way thru the membrane channel proteins receptor proteins Peripheral Proteins on inside or outside of membrane +/- attached to integral proteins
found in: plant cells fungi cells algae bacteria secreted by cell membrane allow O 2, CO 2, glucose, & H 2 O to pass through
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This is a Foldable * Use 4 sheets of paper. It should look like this.. ( Next slide )
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